diff --git a/src/utils/is-redirect-status-code.ts b/src/utils/is-redirect-status-code.ts
index 7c373e2b6..728d21769 100644
--- a/src/utils/is-redirect-status-code.ts
+++ b/src/utils/is-redirect-status-code.ts
@@ -1,5 +1,8 @@
 const REDIRECT_STATUS_CODES = [301, 302, 303, 307, 308];
 
-export default function (code: number): boolean {
+export default function (code?: number): boolean {
+    if (!code)
+        return false;
+
     return REDIRECT_STATUS_CODES.includes(code);
 }
diff --git a/ts-defs/index.d.ts b/ts-defs/index.d.ts
index 6d414b4bf..ca5be371f 100644
--- a/ts-defs/index.d.ts
+++ b/ts-defs/index.d.ts
@@ -592,7 +592,7 @@ declare module 'testcafe-hammerhead' {
     function getAssetPath(originPath: string, developmentMode: boolean): string;
 
     /** Return whether the HTTP status code is a redirect status code **/
-    function isRedirectStatusCode (code: number): boolean;
+    function isRedirectStatusCode (code?: number): boolean;
 
     /**  **/
     export class IncomingMessageLike {